真子集

zhēnzǐjí
noun

Meanings

  1. 1 proper subset (mathematics)

Examples

HSK 6
Rúguǒ A shì B de zhēnzǐjí, nàme A zhìshǎo quēshǎo B de yígè yuánsù.
If A is a proper subset of B, then A is missing at least one element of B.
HSK 7-9
Zìrán shù jí shì zhěngshù jí de zhēnzǐjí.
The set of natural numbers is a proper subset of the set of integers.

Tips

usage
真 (true/genuine) + 子集 (subset) - the 真 marks "strict" inclusion, i.e. A ⊊ B. Without 真, 子集 covers both proper and improper subsets, matching A ⊆ B.

Stroke Order

真 zhēn
子 zǐ
集 jí